Bone age is short for skeletal age and is determined with the help of a specific image of the bone in an X-ray camera. To find out the age of a child’s bones, an X-ray of the child’s wrist is usually taken, through which the doctor observes the appearance of ossification centers, the development of bone masses and the healing process of the epiphysis and diaphysis to determine the age of the child’s bones. Bone age is a good indicator of the maturity of the human body. It can not only determine the biological age of a child, but also provide an early understanding of a child’s growth potential and the trend of sexual maturity: the adult height of a child can also be predicted by bone age, and the determination of bone age is also very helpful for the diagnosis of some pediatric endocrine diseases. There are three commonly used methods to determine the bone age of children: 1. The bone age is determined by the number of ossification centers in the wrist. The maturity of bone development is determined by observing the number of ossification centers sprouting from the wrist of the examined child: if the skull and hook bone appear, the bone age is equivalent to 6 months: if the triangular bone appears, the bone age is equivalent to 3 years old …… This method is more suitable for children before 7 years old. This method is more suitable for children before 7 years old. When the number, shape and size of the ossification centers of the child’s wrist are more consistent with the ossification centers shown in the standard atlas at a certain age, the age on this atlas is the bone age of the child. This atlas is suitable for children and adolescents aged 0-19 years old. 3.Score the bone age according to the developmental changes of wrist bone shape and size. The development of each ossification center in the wrist of the examined child is scored in stages, and the corresponding bone age is found after accumulating the total score. This method is more comprehensive and objective than the previous two methods, and is also more accurate, but it is not commonly used in outpatient clinics because it is cumbersome and complicated. Studies have shown that there is an extremely close interrelationship between bone age and child height: children of medium stature have a difference between bone age and chronological age of less than one year; children of tall stature have a bone age that exceeds chronological age by more than one year (early development). If the degree of skeletal maturity is considered in conjunction with the height of the child, it is possible to determine the type of height of the child in adulthood. If the child’s bone age and stature are both at a low level, i.e., the bone age is backward and the stature is also short, the child can develop into a normal height person in the future (late development); if the child’s bone age is backward and the stature is medium or high, the child may develop into a high stature person (currently many junior sports schools often look for this type of child); if the child’s bone age is high and the stature is short, the child is likely to become a short stature person in the future; if the child’s bone age is high and the stature is short, the child is likely to become a short stature person in the future. If the child’s bone age and height are both at a high level, the child’s growth potential is not great and may not eventually become a high stature (early development). It is important to note that if a child’s bone age differs from the chronological age by more than two years, the child should be carefully examined at a hospital. This is because abnormalities in bone age are often an aspect of certain endocrine disorders manifested in pediatrics. As a parent, when you find abnormal growth in your child, you should go to the hospital as soon as possible and ask your doctor to help you find the cause. It is best to take an X-ray of the wrist to determine the bone age and decide whether to use medication and what kind of medication to avoid the abuse of “growth agents”. These drugs will accelerate the bone healing process, but inhibit the continued growth of height.